Materials Literature
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We have studied the current-induced displacement of a domain wall (DW) in the permalloy (Py) layer of a Co/Cu/Py spin valve structure at zero and very small applied field. The displacement is in opposite direction for opposite dc currents, and the current density required to move DW is only of the order of 10^6 A/cm^2…
A study of the anisotropy in magnetic, transport, and magnetotransport properties of ${\mathrm{FeSb}}_{2}$ has been made on large single crystals grown from Sb flux. Magnetic susceptibility of ${\mathrm{FeSb}}_{2}$ shows diamagnetic to paramagnetic crossover around 100 K. Electrical transport along two axes is semicon…
Experiments were conducted to prepare ordered mesoporous silica fibers under different conditions (precursor type, temperature, acid concentration, and growth time). The ordered mesoporous silica fibers can be obtained with tetrabutyl orthosilicate as the silica source under the following conditions: temperature at 30…
31P solid-state nuclear magnetic resonance (NMR) spectra of 12 metal-containing selenophosphates have been examined to distinguish between the [P(2)Se(6)](4-), [PSe(4)](3-), [P(4)Se(10)](4-), [P(2)Se(7)](4-), and [P(2)Se(9)](4-) anions. There is a general correlation between the chemical shifts (CSs) of anions and the…
Treatment of 5,10,15,20-tetraarylporphyrins (1) with perfluoroalkyl iodides (2) in the presence of Na(2)S(2)O(4)/NaHCO(3) in DMSO-CH(2)Cl(2) at 30-40 degrees C for several hours gives the corresponding 2-perfluoroalkylporphyrins (3). Nucleophilic attack on 3 with dimethyl malonate, diethyl malonate, malonitrile, or cy…
Ordered nanoporous carbons can be prepared by a replica technique starting from an organized silica template. The silica template used, SBA-15, displays hexagonal arrangements of mesopores interconnected by micropores. Two routes are possible for introducing carbon into the pores of the silica: liquid impregnation by…
Inclusion complexed (IC) and coalesced biodegradable poly(epsilon-caprolactone) (PCL), poly(L-lactic acid) (PLLA), and their diblock copolymer (PCL-b-PLLA) were achieved by forming ICs between host alpha-cyclodextrin(alpha-CD) and guest PCL, PLLA, and PCL-b-PLLA, followed by removing the alpha-CD host with an amylase…
Novel liquid-crystal materials based on 1-alkyl-4-[5-(dodecylsulfanyl)-1,3,4-oxadiazol-2-yl]pyridinium bromide derivatives were synthesized. Their thermotropic polymorphism was investigated by polarizing optical microscopy and differential scanning calorimetry. The structures of their crystalline and smectic A phases…
Dielectric study was performed on the polyisoprene (PI)/poly(vinyl ethylene) (PVE) miscible blends. We observed the end-to-end vector fluctuation dynamics (normal mode) of PI as well as the two α-relaxation processes corresponding to the segmental motions of PVE and PI. Among these three relaxation modes, the normal m…
The adsorption of highly oppositely charged flexible polyelectrolytes on a charged sphere is investigated by means of Monte Carlo simulations in a fashion which resembles the layer-by-layer deposition technique introduced by Decher. Electroneutrality is ensured at each step by the presence of monovalent counterions (a…
Cu3(O2C16H23)6.1.2C6H12, containing a Cu36+ core in an equilateral triangle geometry, has been found to be a versatile model system for investigating the spin-frustration phenomenon in a triangular lattice. It affords well-resolved EPR spectra from both of the two possible (Stotal = 1/2 and 3/2) spin states of the Cu3…
The crystallographic three-dimensional structure of the Escherichia coli maa gene product, previously identified as a maltose O-acetyltransferase (MAT) [Brand, B., and Boos, W. (1991) J. Biol. Chem. 266, 14113-14118] has been determined to 2.15 A resolution by the single anomalous dispersion method using data from a c…
The system Al 2 O 3 −B 2 O 3 containing Ce 3+ and Tb 3+ ions was investigated for the first time. It was found that certain compositions give rise to a new highly efficient green luminescent material. The investigation of structure by XRD, 11 B MAS NMR spectra, IR spectra, high-resolution electron microscopy, and sele…
Three linear diblock copolymers (PS- b -P2MP), two 3-miktoarm [PS(P2MP) 2 ] copolymers, and two 4-miktoarm star copolymers [PS(P2MP) 3 ] of styrene (S) and 2-methyl-1,3-pentadiene (2MP) were synthesized by anionic polymerization/high vacuum techniques and controlled chlorosilane chemistry. Molecular characterization o…
Surface binding between the carboxylic group and the TiO 2 nanoparticle is important in the potentially applicable dye-sensitized mesoporous TiO 2 crystalline solar cell. However, the nature of the surface binding is still not clear enough. We propose a new method to study the surface binding between the carboxylic gr…
The thermolysis products obtained by refluxing a series of vic-dihydroxychlorins in o-dichlorobenzene are characterized. Depending on the nature of substrates, this methodology provides an access for novel carbon-carbon linked chlorin-chlorin dimers and chlorin-porphyrin dimers with fixed and flexible orientations. Th…
We treat the non-relativistic Compton scattering process in which an incoming photon scatters from an N-electron many-body state to yield an outgoing photon and a recoil electron, without invoking the commonly used frameworks of either the impulse approximation (IA) or the independent particle model (IPM). An expressi…
A new method for doing feedback control of single quantum systems was proposed. Instead of feeding back precisely the process output, a cloning machine served to obtain the feedback signal and the output. A simple example was given to demonstrate the method.
We show that dipole-field induced antiferromagnetic coupling, or RKKY ferromagnetic coupling, between Co layers can strongly affect the low magnetic field switching behavior of Co/Cu/Co nanopillars. Whereas current-assisted switching at low fields in uncoupled nanopillars is always hysteretic, strong coupling of eithe…
Glass-coated, analyte-tagged nanoparticles (GANs) are core−shell particles where a nanometer-scale Au or Ag core is functionalized with Raman active molecules and encapsulated in a glass shell. The glass shell provides the particle with mechanical and chemical stability. Specifically, the glass coating renders the par…